無法將START_ARRAY標記的java.lang.String實例反序列化;

Question

請幫我這個降壓：

Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Can not deserialize instance of java.lang.String out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.String out of START_ARRAY token 
at [Source: java.io.PushbackInputStream@4010b719; line: 1, column: 31] 

我發送以下JSON請求：

{"title": "Test", "category": ["2","4","3",1], "description": "Test", "username": ""} 

在 「類別」 欄中出現的錯誤。

我用一個PostgreSQL數據庫 和我有以下型號：

@Id 
@Column(name = "ID") 
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "idea_seq") 
@SequenceGenerator(name = "idea_seq", sequenceName = "idea_seq", allocationSize = 1) 
private Integer id; 

@Column(name = "TITLE", length = 100) 
@NotNull 
@Size(min = 1, max = 100) 
private String title; 

@Column(name = "CATEGORY", length = 10) 
@NotNull 
@Size(min = 1, max = 100) 
private String[] category; 

@Column(name = "DESCRIPTION", length = 1000) 
@NotNull 
@Size(min = 1, max = 1000) 
private String description; 

@Column(name = "USERNAME", length = 100) 
@NotNull 
@Size(min = 1, max = 100) 
private String username; 

我會很高興的任何幫助。我已經有這個bug幾天了。

Answer 1

您類別JSON包含數：

「類別」：[ 「2」， 「4」， 「3」，]

這需要被引用。